2 * Copyright (C) 2001, 2002 The Mir-coders group
4 * This file is part of Mir.
6 * Mir is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * Mir is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with Mir; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * In addition, as a special exception, The Mir-coders gives permission to link
21 * the code of this program with any library licensed under the Apache Software License,
22 * The Sun (tm) Java Advanced Imaging library (JAI), The Sun JIMI library
23 * (or with modified versions of the above that use the same license as the above),
24 * and distribute linked combinations including the two. You must obey the
25 * GNU General Public License in all respects for all of the code used other than
26 * the above mentioned libraries. If you modify this file, you may extend this
27 * exception to your version of the file, but you are not obligated to do so.
28 * If you do not wish to do so, delete this exception statement from your version.
32 import mir.log.LoggerWrapper;
33 import mir.storage.Database;
34 import mir.storage.store.StorableObject;
35 import mir.storage.store.StoreContainerType;
36 import mir.storage.store.StoreIdentifier;
37 import mir.storage.store.StoreUtil;
39 import java.util.ArrayList;
40 import java.util.List;
45 * Container class for lists of Entities.
46 * Now implements @see mir.database.store.StorableObject.
49 * first version 27.6.1999
51 * @version 1.1 (cleaned up)
53 public class EntityList implements StorableObject {
54 protected LoggerWrapper logger;
55 private List entities = new ArrayList();
56 private String whereClause, orderClause;
57 private Database storage;
58 private int offset, limit;
59 private int nextOffset = -1;
62 logger = new LoggerWrapper("Entity.List");
65 public void setStorage(Database aStorage) {
69 public Database getStorage() {
73 public void setLimit(int aLimit) {
78 * Sets the WHERE clause that fetched the Entities of this EntityList from the database.
80 * @param wc The string that contains the WHERE clause
82 public void setWhere(String wc) {
83 this.whereClause = wc;
87 * Sets the sorting criterium of this EntityList
91 public void setOrder(String oc) {
92 this.orderClause = oc;
100 public void setOffset(int i) {
109 public int getOffset() {
114 * Sets the offset of the next batch of Entities.
116 * @param i The next offset
118 public void setNextBatch(int i) {
123 * Returns the offset of the next batch of Entities.
125 * @return offset of the next batch
127 public int getNextBatch() {
132 * Returns whether there is a next batch within the WHERE clause
134 * @return true if yes, false if no.
136 public boolean hasNextBatch() {
137 return (nextOffset >= 0);
141 * Inserts an Entity into the EntityList.
143 * @param anEntity The entity to be inserted.
146 public void add (Entity anEntity) {
148 entities.add(anEntity);
150 logger.warn("EntityList: add called with empty Entity");
155 * @return The number of Entities in the EntityList.
159 return entities.size();
164 * Returns the element at position i in the EntityList as Entity
165 * @param i the position of the element in question
166 * @return The element at position i.
169 public Entity elementAt(int i) {
170 return (Entity) entities.get(i);
175 // Methods to implement StorableObject
177 public Set getNotifyOnReleaseSet() { return null; }
179 public StoreIdentifier getStoreIdentifier() {
180 if ( storage!=null ) {
183 this, StoreContainerType.STOC_TYPE_ENTITYLIST,
184 StoreUtil.getEntityListUniqueIdentifierFor( storage.getTableName(),
185 whereClause, orderClause, offset, limit ));
187 logger.warn("EntityList could not return StoreIdentifier");